107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
#include <engine/platform/graphics/opengl/buffers.hpp>
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#include <engine/platform/graphics/opengl/vertex_layout.hpp>
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#include <glad/gl.h>
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namespace Light {
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glVertexLayout::glVertexLayout(
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const Ref<VertexBuffer>& buffer,
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const std::vector<std::pair<std::string, VertexElementType>> &elements
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)
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: m_array_id(NULL)
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{
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// check
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lt_assert(
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std::dynamic_pointer_cast<glVertexBuffer>(buffer),
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"Failed to cast 'VertexBuffer' to 'glVertexBuffer'"
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);
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lt_assert(!elements.empty(), "'elements' is empty");
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// local
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auto elementsDesc = std::vector<glVertexElementDesc> {};
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elementsDesc.reserve(elements.size());
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auto stride = 0u;
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// extract elements desc
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for (const auto &element : elements)
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{
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elementsDesc.push_back(get_element_desc(element.second, stride));
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stride += elementsDesc.back().typeSize * elementsDesc.back().count;
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}
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// create vertex array
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glCreateVertexArrays(1, &m_array_id);
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// bind buffer and array
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buffer->bind();
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bind();
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// enable vertex attributes
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auto index = 0u;
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for (const auto &elementDesc : elementsDesc)
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{
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glVertexAttribPointer(
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index,
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elementDesc.count,
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elementDesc.type,
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GL_FALSE,
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stride,
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(const void *)elementDesc.offset
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);
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glEnableVertexAttribArray(index++);
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}
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}
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glVertexLayout::~glVertexLayout()
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{
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glDeleteVertexArrays(1, &m_array_id);
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}
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void glVertexLayout::bind()
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{
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glBindVertexArray(m_array_id);
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}
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void glVertexLayout::un_bind()
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{
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glBindVertexArray(NULL);
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}
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auto glVertexLayout::get_element_desc(VertexElementType type, unsigned int offset)
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-> glVertexElementDesc
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{
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switch (type)
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{
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/* byte */
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case Light::VertexElementType::Byte1: return { .type=GL_BYTE, .count=1u, .typeSize=sizeof(GLbyte), .offset=offset };
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case Light::VertexElementType::Byte2: return { .type=GL_BYTE, .count=1u, .typeSize=sizeof(GLbyte), .offset=offset };
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case Light::VertexElementType::Byte4: return { .type=GL_BYTE, .count=1u, .typeSize=sizeof(GLbyte), .offset=offset };
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/* ubyte */
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case Light::VertexElementType::UByte1: return { .type=GL_UNSIGNED_BYTE, .count=1u, .typeSize=sizeof(GLubyte), .offset=offset };
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case Light::VertexElementType::UByte2: return { .type=GL_UNSIGNED_BYTE, .count=2u, .typeSize=sizeof(GLubyte), .offset=offset };
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case Light::VertexElementType::UByte4: return { .type=GL_UNSIGNED_BYTE, .count=4u, .typeSize=sizeof(GLubyte), .offset=offset };
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/* int */
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case VertexElementType::Int1: return { .type=GL_INT, .count=1u, .typeSize=sizeof(GLint), .offset=offset };
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case VertexElementType::Int2: return { .type=GL_INT, .count=2u, .typeSize=sizeof(GLint), .offset=offset };
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case VertexElementType::Int3: return { .type=GL_INT, .count=3u, .typeSize=sizeof(GLint), .offset=offset };
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case VertexElementType::Int4: return { .type=GL_INT, .count=4u, .typeSize=sizeof(GLint), .offset=offset };
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/* uint */
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case VertexElementType::UInt1: return { .type=GL_UNSIGNED_INT, .count=1u, .typeSize=sizeof(GLuint), .offset=offset };
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case VertexElementType::UInt2: return { .type=GL_UNSIGNED_INT, .count=2u, .typeSize=sizeof(GLuint), .offset=offset };
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case VertexElementType::UInt3: return { .type=GL_UNSIGNED_INT, .count=3u, .typeSize=sizeof(GLuint), .offset=offset };
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case VertexElementType::UInt4: return { .type=GL_UNSIGNED_INT, .count=4u, .typeSize=sizeof(GLuint), .offset=offset };
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/* float */
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case VertexElementType::Float1: return { .type=GL_FLOAT, .count=1u, .typeSize=sizeof(GLfloat), .offset=offset };
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case VertexElementType::Float2: return { .type=GL_FLOAT, .count=2u, .typeSize=sizeof(GLfloat), .offset=offset };
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case VertexElementType::Float3: return { .type=GL_FLOAT, .count=3u, .typeSize=sizeof(GLfloat), .offset=offset };
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case VertexElementType::Float4: return { .type=GL_FLOAT, .count=4u, .typeSize=sizeof(GLfloat), .offset=offset };
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default: lt_assert(false, "Invalid 'VertexElementType'"); return {};
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}
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}
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} // namespace Light
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